Amplitude modes in three-dimensional spin dimers away from quantum critical point

doi:10.1103/PhysRevResearch.1.033111

Title: Amplitude modes in three-dimensional spin dimers away from quantum critical point

Abstract

Magnetic excitations of long-range ordered localized spin systems are generally well described by the linear spin-wave theory which accounts for phase fluctuations of the order parameter. In contrast, quasiparticles associated with amplitude fluctuations are only observed in a few quantum antiferromagnets close to a quantum critical point (QCP), where the ordered moment is suppressed significantly from its fully saturated value. Via inelastic neutron scattering measurements and extended spin-wave calculations, we present the observation and explanation of amplitude modes in the magnetic excitation spectra of three-dimensional S = 3/2 spin dimers Cr₂TeO₆ and Cr₂WO₆, which nevertheless are away from the QCP with the ordered moment reduced by only ~24%. We show that the large spin of Cr³⁺ and narrow bandwidth of the amplitude modes render their detection even in polycrystalline samples. This paper suggests that amplitude modes are not the privilege of ordered spin systems in the vicinity of a QCP, but may be common excitation modes that can survive even away from the QCP, paving a way to search for and understand the physics of amplitude fluctuations in antiferromagnets beyond the quantum spin limit (S=1/2).

Authors:

; Matsumoto, M.; Stone, M. B.; Dun, Z. L.; Zhou, H. D.; Hong, T.; Zou, T.; Mahanti, S. D.; Ke, X.

Publication Date:: 2019-11-19

Research Org.:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Org.:: USDOE Office of Science (SC); National Science Foundation (NSF); JSPS KAKENHI

OSTI Identifier:: 1574550

Alternate Identifier(s):: OSTI ID: 1666022

Grant/Contract Number:: AC05-00OR22725; 17K05516; DMR-1350002; DMR-1608752

Resource Type:: Published Article

Journal Name:: Physical Review Research

Additional Journal Information:: Journal Name: Physical Review Research Journal Volume: 1 Journal Issue: 3; Journal ID: ISSN 2643-1564

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: Magnetism; spin dynamics; magnetic systems; inelastic neutron scattering

Citation Formats


                    Zhu, M., Matsumoto, M., Stone, M. B., Dun, Z. L., Zhou, H. D., Hong, T., Zou, T., Mahanti, S. D., and Ke, X. Amplitude modes in three-dimensional spin dimers away from quantum critical point.  United States: N. p., 2019. 
        Web.  doi:10.1103/PhysRevResearch.1.033111.

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                    Zhu, M., Matsumoto, M., Stone, M. B., Dun, Z. L., Zhou, H. D., Hong, T., Zou, T., Mahanti, S. D., & Ke, X. Amplitude modes in three-dimensional spin dimers away from quantum critical point.  United States.  doi:10.1103/PhysRevResearch.1.033111.

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                    Zhu, M., Matsumoto, M., Stone, M. B., Dun, Z. L., Zhou, H. D., Hong, T., Zou, T., Mahanti, S. D., and Ke, X. Tue .  
        "Amplitude modes in three-dimensional spin dimers away from quantum critical point".  United States.  doi:10.1103/PhysRevResearch.1.033111.

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@article{osti_1574550,

  title        = {Amplitude modes in three-dimensional spin dimers away from quantum critical point},

  author       = {Zhu, M. and Matsumoto, M. and Stone, M. B. and Dun, Z. L. and Zhou, H. D. and Hong, T. and Zou, T. and Mahanti, S. D. and Ke, X.},

  abstractNote = {Magnetic excitations of long-range ordered localized spin systems are generally well described by the linear spin-wave theory which accounts for phase fluctuations of the order parameter. In contrast, quasiparticles associated with amplitude fluctuations are only observed in a few quantum antiferromagnets close to a quantum critical point (QCP), where the ordered moment is suppressed significantly from its fully saturated value. Via inelastic neutron scattering measurements and extended spin-wave calculations, we present the observation and explanation of amplitude modes in the magnetic excitation spectra of three-dimensional S = 3/2 spin dimers Cr2TeO6 and Cr2WO6, which nevertheless are away from the QCP with the ordered moment reduced by only ~24%. We show that the large spin of Cr3+ and narrow bandwidth of the amplitude modes render their detection even in polycrystalline samples. This paper suggests that amplitude modes are not the privilege of ordered spin systems in the vicinity of a QCP, but may be common excitation modes that can survive even away from the QCP, paving a way to search for and understand the physics of amplitude fluctuations in antiferromagnets beyond the quantum spin limit (S=1/2).},

  doi          = {10.1103/PhysRevResearch.1.033111},

  journal      = {Physical Review Research},

  number       = 3,

  volume       = 1,

  place        = {United States},

  year         = {2019},

  month        = {11}

}

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Title: Amplitude modes in three-dimensional spin dimers away from quantum critical point

Abstract

Citation Formats

Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point journal, July 2017

Spin dynamics of chromium. II. Incommensurate alloys journal, September 1996

Haldane-gap modes in the S =1 antiferromagnetic chain compound CsNiCl 3 journal, September 1990

Longitudinal spin fluctuations of coupled integer-spin chains: Haldane triplet dynamics in the ordered phase of CsNiCl 3 journal, February 1999

Colloquium : Majorana fermions in nuclear, particle, and solid-state physics journal, February 2015

Spin dynamics of chromium. I. Formalism and commensurate alloys journal, September 1996

Universal relaxational dynamics near two-dimensional quantum critical points journal, June 1999

Longitudinal magnetic excitation in KCuCl 3 studied by Raman scattering under hydrostatic pressures journal, December 2012

Theory of two-dimensional quantum Heisenberg antiferromagnets with a nearly critical ground state journal, May 1994

Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet journal, May 2017

Magnetic exchange interactions within binuclear entities of chromium III journal, October 1979

Magnetic properties and spin waves of bilayer magnets in a uniform field journal, October 2001

Amplitude collective modes in superconductors and their coupling to charge-density waves journal, November 1982

Quantum Magnets under Pressure: Controlling Elementary Excitations in TlCuCl 3 journal, May 2008

Magnetic excitations in the spin gap system KCuCl3 and TlCuCl3 journal, September 1999

Magnon Dispersion in the Field-Induced Magnetically Ordered Phase of T l C u C l 3 journal, July 2002

Dynamics of Multipoles and Neutron Scattering Spectra in Quadrupolar Ordering Phase of CeB 6 journal, May 2003

Spin-Stretching Modes in Anisotropic Magnets: Spin-Wave Excitations in the Multiferroic Ba 2 CoGe 2 O 7 journal, June 2012

Dynamical properties of an antiferromagnet near the quantum critical point: Application to LaCuO 2.5 journal, October 1997

Longitudinal modes in quasi-one-dimensional antiferromagnets journal, October 1992

Coherent Excited States in the Theory of Superconductivity: Gauge Invariance and the Meissner Effect journal, May 1958

Amplitude mode in the planar triangular antiferromagnet Na0.9MnO2 journal, June 2018

Raman Scattering by Superconducting-Gap Excitations and Their Coupling to Charge-Density Waves journal, August 1980

Longitudinal and Transverse Zeeman Ladders in the Ising-Like Chain Antiferromagnet BaCo 2 V 2 O 8 journal, January 2015

Visibility of the amplitude (Higgs) mode in condensed matter journal, November 2011

Phase transition, longitudinal spin fluctuations, and scaling in a two-layer antiferromagnet journal, August 1995

Quantum and classical criticality in a dimerized quantum antiferromagnet journal, April 2014

Light-induced collective pseudospin precession resonating with Higgs mode in a superconductor journal, July 2014

The ‘Higgs’ amplitude mode at the two-dimensional superfluid/Mott insulator transition journal, July 2012

Nearly critical ground state of LaCuO 2.5 journal, March 1997

Higgs Amplitude Mode in the BCS Superconductors Nb 1 − x Ti x N Induced by Terahertz Pulse Excitation journal, July 2013

Field- and pressure-induced magnetic quantum phase transitions in TlCuCl 3 journal, February 2004

Novel Longitudinal Mode in the Coupled Quantum Chain Compound KCuF 3 journal, July 2000

Broken symmetries, massless particles and gauge fields journal, September 1964

Tuning the Magnetic Exchange via a Control of Orbital Hybridization in Cr 2 ( Te 1 − x W x ) O 6 journal, August 2014

Magnetic structures of the ordered trirutiles Cr2WO6, Cr2TeO6 and Fe2TeO6 journal, August 1968

Amplitude/Higgs Modes in Condensed Matter Physics journal, March 2015

Higgs mode and its decay in a two-dimensional antiferromagnet journal, March 2017

Broken Symmetries and the Masses of Gauge Bosons journal, October 1964

Higgs amplitude mode in a two-dimensional quantum antiferromagnet near the quantum critical point
journal, July 2017

Spin dynamics of chromium. II. Incommensurate alloys
journal, September 1996

Haldane-gap modes in the S =1 antiferromagnetic chain compound ${CsNiCl}_{3}$
journal, September 1990

Longitudinal spin fluctuations of coupled integer-spin chains: Haldane triplet dynamics in the ordered phase of ${CsNiCl}_{3}$
journal, February 1999

Colloquium : Majorana fermions in nuclear, particle, and solid-state physics
journal, February 2015

Spin dynamics of chromium. I. Formalism and commensurate alloys
journal, September 1996

Universal relaxational dynamics near two-dimensional quantum critical points
journal, June 1999

Longitudinal magnetic excitation in KCuCl ₃ studied by Raman scattering under hydrostatic pressures
journal, December 2012

Theory of two-dimensional quantum Heisenberg antiferromagnets with a nearly critical ground state
journal, May 1994

Field induced spontaneous quasiparticle decay and renormalization of quasiparticle dispersion in a quantum antiferromagnet
journal, May 2017

Magnetic exchange interactions within binuclear entities of chromium III
journal, October 1979

Magnetic properties and spin waves of bilayer magnets in a uniform field
journal, October 2001

Amplitude collective modes in superconductors and their coupling to charge-density waves
journal, November 1982

Quantum Magnets under Pressure: Controlling Elementary Excitations in ${TlCuCl}_{3}$
journal, May 2008

Magnetic excitations in the spin gap system KCuCl3 and TlCuCl3
journal, September 1999

Magnon Dispersion in the Field-Induced Magnetically Ordered Phase of ${T l C u C l}_{3}$
journal, July 2002

Dynamics of Multipoles and Neutron Scattering Spectra in Quadrupolar Ordering Phase of CeB ₆
journal, May 2003

Spin-Stretching Modes in Anisotropic Magnets: Spin-Wave Excitations in the Multiferroic ${Ba}_{2} {CoGe}_{2} O_{7}$
journal, June 2012

Dynamical properties of an antiferromagnet near the quantum critical point: Application to ${LaCuO}_{2.5}$
journal, October 1997

Longitudinal modes in quasi-one-dimensional antiferromagnets
journal, October 1992

Coherent Excited States in the Theory of Superconductivity: Gauge Invariance and the Meissner Effect
journal, May 1958

Amplitude mode in the planar triangular antiferromagnet Na0.9MnO2
journal, June 2018

Raman Scattering by Superconducting-Gap Excitations and Their Coupling to Charge-Density Waves
journal, August 1980

Longitudinal and Transverse Zeeman Ladders in the Ising-Like Chain Antiferromagnet ${BaCo}_{2} V_{2} O_{8}$
journal, January 2015

Visibility of the amplitude (Higgs) mode in condensed matter
journal, November 2011

Phase transition, longitudinal spin fluctuations, and scaling in a two-layer antiferromagnet
journal, August 1995

Quantum and classical criticality in a dimerized quantum antiferromagnet
journal, April 2014

Light-induced collective pseudospin precession resonating with Higgs mode in a superconductor
journal, July 2014

The ‘Higgs’ amplitude mode at the two-dimensional superfluid/Mott insulator transition
journal, July 2012

Nearly critical ground state of ${LaCuO}_{2.5}$
journal, March 1997

Higgs Amplitude Mode in the BCS Superconductors ${Nb}_{1 − x} {Ti}_{x} N$ Induced by Terahertz Pulse Excitation
journal, July 2013

Field- and pressure-induced magnetic quantum phase transitions in ${TlCuCl}_{3}$
journal, February 2004

Novel Longitudinal Mode in the Coupled Quantum Chain Compound ${KCuF}_{3}$
journal, July 2000

Broken symmetries, massless particles and gauge fields
journal, September 1964

Tuning the Magnetic Exchange via a Control of Orbital Hybridization in ${Cr}_{2} ({Te}_{1 - x} W_{x}) O_{6}$
journal, August 2014

Magnetic structures of the ordered trirutiles Cr2WO6, Cr2TeO6 and Fe2TeO6
journal, August 1968

Amplitude/Higgs Modes in Condensed Matter Physics
journal, March 2015

Higgs mode and its decay in a two-dimensional antiferromagnet
journal, March 2017

Broken Symmetries and the Masses of Gauge Bosons
journal, October 1964